draft: feat pavone voi & add shader hints
this PR adds VOI from Pavone, hosted on 1um.brainatlas.eu
this PR also adds shader hint to voi. This adds metadata on how the volume should be interpreted, and, adds context when multi channel data are available and how they should be interpreted.
This should eventually (possibly already) supercede the shader
key value pair in volume object.
shaderHint
:
- can be null. But if defined, should be an array.
- each element in the array describes each of the channel in the volume.
- each element has the following key value pair:
-
hint: string
: hint on how the channel should be rendered. Can be any of the following values:red
,green
,blue
,grey
,heatmap
-
Edited by Gui, Xiaoyun